Quote:
Originally Posted by Shawn D.
That does indeed work quite well to remove carbon on the piston tops and combustion chamber. Sure, if you ran a garden hose into the carb, you would hydrolock the engine. However, that's not how it's done.
Once the engine is warm and running at a fast idle, pour the water down the carb at a rate that gives you about a 1/8" thick stream. If the carb has more barrels than one, vary between the primary barrels so as to get all branches of the manifold. If the engine starts to struggle, back off on the flow.
Once you're done (maybe one quart per liter of engine size is good), go for a drive to make sure any moisture that got past the rings is boiled off, and it'd be a good idea to change the oil.
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Well, just for the hell of it I did it on a Willys-Knight sedan I drove around,smoky,carbony sleeve-valve engine. Just a little at a time,thru a small hose into the Tillotson updraft at mid-throttle and I must say the car ran much better with less vibration and I could advance the spark with no pinging,so it does have some merit,but I know a guy who did it to his 4 bolt Chevy and cracked 2 exhaust valve seats.